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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 8
 4
 1

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 30 volts.
 10 volts.
 20 volts.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 remain unaltered
 increase by 100%
 increase by 200%
 reduced to half

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
 any one of above.
 due to wrong direction of rotation.
  if it has lost residual magnetism.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

None of these
  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.
  the supply voltage and the back emf.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  under-compounded.
  differential compounded.
  shunt.
  over compounded.

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MORE MCQ ON Electrical Machines

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